Hey Guys,

I really appreciate all the ideas and feedback!

It's still not fixed but some progress has been made. Since my first post I have done the following:

• Removed and flushed clean the vanos solenoids.
  They weren't too dirty. Idle feels a bit "crisper".
  
• Ran a bottle of techron concentrated fuel injector cleaner through a tank.
  No change at all.
  
• Replaced the waterpump
  This actually cleared all of the false DME DTC's! Now the waterpump doesn't run with the engine off, the alternator, oil level sensor, battery sensor etc. all report and function correctly!
  
• Double checked that the trans fluid was properly filled.
  Around a year ago I had flushed the trans fluid and replaced the trans filter. Somebody told me that torque converter shudders can feel a lot like a misfire, usually caused by not enough trans fluid. This got me thinking and doubting that I had filled it correctly or not. Well after getting trans up to temp and following the fill procedure again it was filled perfect. I also reset the trans adaptations and went through the re-learn procedure. No change in driving.

So today I had my wife drive the car while I monitored different variables, especially the "Rough running value" for all 6 cylinders (I believe this is the "run unrest" test that ard mentioned). Unfortunately all cylinders seem to randomly show high/low values so it's not very conclusive as far as I can tell. I screen recorded this and more off of my phone and uploaded it to YT:



List of theories:

• Broken oil filter cap - I'll be checking this tomorrow.
• Alternator - I highly doubt this as I have a battery monitor and it shows the alternator charge amps and volts to be correct and working normally.
• Low or High pressure fuel pump
• Bad Injector
• Some rogue intermittent bad sensor (timing or pressure)
• Somehow still a bad coil or plug
• Bade DME?